My question is why nowadays some operating system event handling is still written in assembly language instead of a higher level language such as C, when the kernel itself is written mostly in C?
Why some operating systems event handling is written in asm instead of c
assemblyckernel
Best Answer
The language abstracts away access to CPU registers, and an OS when handling events has to save context, so it needs access to the registers at the point of the event, thus breaking the C spec.